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<?php class MyClass { public $prop; } $foo = new MyClass(); $foo->prop = 'test1'; $bar = $foo; $bam = new MyClass(); $bam->prop = 'test2'; $t = new MyClass(); $t->prop = 'test1'; $test = array($foo, $bar, $bam, $t); function filter_them( $obj ) { static $new_arr; if ( ! in_array( $obj->prop, $new_arr ) ){ $new_arr[] = $obj->prop; return true; } } print_r(array_filter($test, 'filter_them'));
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
Fatal error: Uncaught TypeError: in_array(): Argument #2 ($haystack) must be of type array, null given in /in/QZvO5:22 Stack trace: #0 /in/QZvO5(22): in_array('test1', NULL) #1 [internal function]: filter_them(Object(MyClass)) #2 /in/QZvO5(28): array_filter(Array, 'filter_them') #3 {main} thrown in /in/QZvO5 on line 22
Process exited with code 255.
Output for 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33
Warning: in_array() expects parameter 2 to be array, null given in /in/QZvO5 on line 22 Array ( [0] => MyClass Object ( [prop] => test1 ) [2] => MyClass Object ( [prop] => test2 ) )
Output for 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17
Warning: in_array(): Wrong datatype for second argument in /in/QZvO5 on line 22 Array ( [0] => MyClass Object ( [prop] => test1 ) [2] => MyClass Object ( [prop] => test2 ) )
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected T_STRING, expecting T_OLD_FUNCTION or T_FUNCTION or T_VAR or '}' in /in/QZvO5 on line 4
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.3.11, 4.4.0 - 4.4.1
Parse error: parse error, unexpected T_STRING, expecting T_OLD_FUNCTION or T_FUNCTION or T_VAR or '}' in /in/QZvO5 on line 4
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `T_OLD_FUNCTION' or `T_FUNCTION' or `T_VAR' or `'}'' in /in/QZvO5 on line 4
Process exited with code 255.
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